Sorry to sound completely daft but how do I maintain the Exif data in a file?

Thanks,

Nick

It depends on what software you use to process the file. If you post which you use you can get specific instructions. But in Photoshop, just use File|Save As, stay clear of Save For Web as this will remove the exif.

I would think the Oly softwares keep the exif when you save/export a jpeg but hopefully someone can come by and confirm.